If the FRITZ!Box obtained a public IPv4 address, proceed with the following section.

If the FRITZ!Box obtained a private IPv4 address, you cannot establish VPN connections to the FRITZ!Box.

2 Checking the login status of the FRITZ!Box's domain name

If the VPN connection occasionally cannot be established, then there may be an issue with the MyFRITZ! or dynamic DNS service. Therefore, check whether the FRITZ!Box is successfully logged into MyFRITZ! or the dynamic DNS service when you attempt to establish the VPN connection:

If MyFRITZ! is enabled or dynamic DNS is "logged on successfully", proceed with the following section.

If MyFRITZ! is not enabled or "logged on successfully" is not displayed for dynamic DNS, wait until the technical issues have been resolved and try to establish the VPN connection at a later time. If there is a permanent error, reconfigure the MyFRITZ! or dynamic DNS account, or refer to the corresponding provider.

3 Mobile Broadband Driver is not supported

The FRITZ!VPN software currently cannot be used with the Mobile Broadband Driver for Windows 8 / 7 or Huawei ("HUAWEI Mobile Connect"). If the internet connection is established by a mobile broadband modem or a mobile broadband dongle that complies with the LTE or UMTS mobile standard, and the modem or dongle uses this driver, you cannot establish a VPN connection with FRITZ!VPN.

Workaround

You can use the FRITZ!VPN software if the mobile broadband modem or mobile broadband dongle can also be used without a Mobile Broadband Driver:

Configure the mobile broadband modem or mobile broadband dongle so that it uses a driver other than the Mobile Broadband Driver from Windows 8 / 7 or from Huawei, for example a "WAN-Miniport(IP)" driver.

Note:Refer to the manufacturer for information on using the mobile broadband modem or mobile broadband dongle with other drivers, for example consult the manual.

4 Configuring a firewall for FRITZ!VPN

If there is a firewall installed on the computer with FRITZ!VPN or if the computer is protected by a NAT router with a firewall, before you can establish a VPN connection you may have to share the ports and IP protocols in the firewall that are required by FRITZ!VPN:

5 Adjusting the IP networks

In order for VPN communication to occur, the computer with FRITZ!VPN and the FRITZ!Box must use different IP networks. If the computer with FRITZ!VPN and the FRITZ!Box are in the same IP network, you must either adapt the IP settings of the computer with FRITZ!VPNor the IP network of the FRITZ!Box:

Example:The FRITZ!Box has the IP address 192.168.178.1 (subnet mask 255.255.255.0) in the factory settings; this means that it uses the IP network 192.168.178.0.If the computer with FRITZ!VPN receives the IP address 192.168.20.13 (subnet mask 255.255.255.0) via DHCP, then it is located in the IP network 192.168.20.0 and can establish VPN connections to the FRITZ!Box.If the computer with FRITZ!VPN is also connected to a FRITZ!Box and both FRITZ!Boxes use the IP network 192.168.178.0, then VPN connections cannot be established.

Adjusting the IP settings of the computer with FRITZ!VPN

Adjust the IP network of the router (for example FRITZ!Box) that the computer with FRITZ!VPN obtains its IP address from. If the computer does not obtain its IP settings via DHCP, change the IP settings on the computer itself.

Adjusting the FRITZ!Box's IP network

Click the "IPv4 Addresses" button. If the button is not displayed, enable the Advanced View first.

Enter the desired IP address and subnet mask.

ATTENTION!Do not enter an IP address from the network 192.168.100.x. In accordance with the DOCSIS specifications, this network is used for maintenance purposes. Using this network would cause IP address conflicts that would result in subsequent errors.

6 Deleting VPN connections and reconfiguring them

If the VPN connection cannot be established at all, then the VPN configuration in FRITZ!VPN or the FRITZ!Box is incorrect, for example due to a typing error, an incorrect MyFRITZ! or dynamic DNS domain name, or an error made when editing the CFG file). Therefore, reconfigure the VPN connection: